The Journal of Physical Chemistry C,
Год журнала:
2023,
Номер
127(38), С. 19159 - 19171
Опубликована: Сен. 13, 2023
Luminescence
thermometry
has
been
a
research
hotspot
due
to
its
rapid
response,
noninvasive
approach,
and
high
spatial
resolution.
However,
achieving
good
relative
sensitivity
with
minimal
temperature
uncertainty
remains
daunting
challenge.
Adding
the
ongoing
research,
our
work
focuses
on
luminescence
application
of
Dy3+/Ho3+-codoped
SrMoO4
phosphor.
The
negative
thermal
quenching
in
Dy3+
emission
is
observed
host.
Interestingly,
codoping
SrMoO4:Ho3+
changes
behavior
Ho3+
from
positive
negative.
intriguing
nature
exploited
for
thermometry.
Due
different
responses
transitions
temperature,
calculated
three
combinations
intensity
ratio.
best
about
0.39%
K–1
at
300
K
evaluated
IDy(572)/IHo(541).
repeatability
measurement
manifests
excellent
stability
luminescence.
found
be
within
0.8
K.
Ho3+-doped
also
probed
lighting
application.
ions
emit
green
emissions
exhibit
by
retaining
∼80%
their
420
0.23
eV
activation
energy.
phosphor
exhibits
resistance
color
drift
rising
temperatures.
Overall,
insights
presented
study
will
broaden
scope
rare-earth-doped
phosphors
fields
optical
applications.
Laser & Photonics Review,
Год журнала:
2023,
Номер
17(3)
Опубликована: Янв. 1, 2023
Abstract
Great
progress
made
by
heteroepitaxial
growth
technology
encourages
rapid
development
of
III‐nitride
structures
and
their
applications
in
extensive
fields.
Particularly,
innate
bandgap
tunability
materials
renders
them
attractive
for
white
light‐emitting
diodes
(WLEDs)
that
are
considered
as
next‐generation
solid‐state
lighting
sources.
However,
commercial
phosphor‐converted
WLEDs
suffer
from
poor
color
rendering
index
(CRI)
intense
blue
component,
hard
to
fulfill
demanding
requirements
simultaneously
energy
efficiency
healthy
lighting.
Here,
an
efficient
full‐spectrum
WLED
excited
monolithically
integrated
quantum
structure
is
reported,
which
trichromatic
InGaN/GaN
multiple
wells
constructed
engineering
heteroepitaxy
allowing
flexible
regulation
indium
composition
barrier
thickness
manipulate
carrier
transport
behavior.
Furthermore,
relationship
between
structural
parameters
emission
characteristics
well
impact
on
light
performance
systematically
demonstrated.
Combined
with
commonly
used
green‐red
phosphor
mixture,
the
fabricated
warm/cold
can
emit
broadband
continuous
spectra
low‐ratio
first
exhibiting
superior
CRI
(>
97/98),
fidelity
(97/97),
saturation
(100/99),
luminous
efficacy
(>120/140
lm
W
−1
).
This
work
demonstrates
advantages
bandgap‐engineered
applied
excitation
source,
opens
up
new
avenues
exploration
high‐quality
Ceramics International,
Год журнала:
2024,
Номер
50(7), С. 11893 - 11903
Опубликована: Янв. 9, 2024
Melt-quenched
borosilicate
glasses,
co-doped
with
Bi
and
V
ions,
exhibited
broad
visible
spectrum
emissions.
ions
primarily
existed
as
Bi3+,
acting
network
modifiers,
lowering
the
glass
transition
temperature
linearly
increasing
content.
V5+
adopted
tetrahedral
coordination
[VO4]3-
units.
Photoluminescence
of
is
shifted
from
blue
to
longer
wavelengths
higher
content,
associated
stabilization
Bi2+
presence
Bi3+
in
different
local
environments.
Combined
glasses
emitted
light
covering
entire
spectrum,
offering
potential
for
white
LED
applications
correlated
color
temperatures
ranging
6135
4010
K.
The
highest
QY
was
11.9
8.0
%
upon
excitation
at
325
340
nm.
Advanced Materials Technologies,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 6, 2025
Abstract
The
growing
demand
for
efficient,
compact,
and
cost‐effective
short‐wave
infrared
(SWIR)
emitters
has
surged
due
to
their
wide‐ranging
applications
in
industries
such
as
biomedical
diagnostics,
food
pharmaceutical
quality
control,
agriculture,
environmental
monitoring.
Conventional
SWIR
sources
are
limited
by
bulkiness,
inefficiency,
high
cost,
while
phosphor‐converted
Light
Emitting
Diodes
(pc‐LEDs)
based
on
transition
metal
ions
or
lanthanides
face
challenges
fixed
wavelengths,
narrow
absorption
bands,
high‐temperature
manufacturing
processes.
Lead
sulfide
(PbS)
colloidal
quantum
dots
(CQDs)
offer
a
promising
alternative,
combining
wavelength
tunability,
synthesis
simplicity,
cost‐effectiveness,
photoluminescence
yield
(PLQY).
In
this
study,
scalable
process
is
introduced
fabricate
flexible,
high‐performance
down‐converters
(DCs)
PbS
CQDs
embedded
an
ethyl
cellulose
(EC)
polymer
matrix.
Performance
enhancements
achieved
through
solution‐phase
ligand
exchange
(SPLE)
with
1‐dodecanethiol
(DDthiol),
improving
passivation
device
efficiency.
When
excited
980
nm
LED,
the
DC
achieves
output
power
density
of
0.54
mW
mm
−
2
photon
conversion
efficiency
≈15%.
A
practical
application
demonstrated
custom‐built
torch
thin‐film
CQD
DCs,
shown
penetrate
smoke,
highlighting
potential
technology
real‐world
use
cases.
ACS Applied Materials & Interfaces,
Год журнала:
2023,
Номер
15(46), С. 53738 - 53745
Опубликована: Ноя. 10, 2023
High-resolution
liquid
crystal
display
(LCD)
backlight
requires
a
color
conversion
layer
featuring
micrometer
light-emitting
particles
and
uniform
morphology.
The
widely
used
commercial
red-emitting
K2SiF6:Mn4+
phosphor,
showing
promise
as
light-conversion
candidate,
faces
limitations
due
to
its
toxic
synthesis
process,
large
particle
size,
poor
moisture
resistance.
We
successfully
demonstrated
an
efficient
substitution
of
the
highly
HF/TEOS/KHF2
solvent
system
with
commonly
HCl/SiO2/KF
synthesize
small-sized
phosphor.
Additionally,
surface
passivation
was
performed
enhance
luminescence
intensity
resistance
moisture,
denoted
K2SiF6:Mn4+@CaF2.
Accordingly,
K2SiF6:Mn4+@CaF2
phosphor
presents
high
efficiency
(99.87%/32.84%
IQE/EQE)
average
size
∼2.67
μm.
Notably,
after
exposure
85%
humidity
85
°C
temperature
for
3
h,
remains
at
47.4%
K2SiF6:Mn4+@CaF2,
while
21.2%
pristine
K2SiF6:Mn4+,
only
3.5%
synthesized
by
TEOS.
These
advancements
hold
great
potential
improving
high-resolution
LCD
backlighting,
particularly
displays
micron-level
pixels,
opening
up
new
possibilities
enhanced
technology.
Journal of Materials Chemistry C,
Год журнала:
2024,
Номер
12(14), С. 5097 - 5107
Опубликована: Янв. 1, 2024
Tuning
the
overall
emission
quantum
yield
(
ϕ
LLn),
dissymmetry
factor
g
lum
),
as
well
CPL
brightness
by
changing
electronic
structure
and
microsymmetry
of
Eu
III
coordination
polyhedron.
Light Science & Applications,
Год журнала:
2024,
Номер
13(1)
Опубликована: Апрель 7, 2024
Abstract
Broadband
electroluminescence
based
on
environment-friendly
emitters
is
promising
for
healthy
lighting
yet
remains
an
unprecedented
challenge
to
progress.
The
copper
halide-based
are
competitive
candidates
broadband
emission,
but
their
high-performance
shows
inadequate
broad
emission
bandwidth
of
less
than
90
nm.
Here,
we
demonstrate
efficient
ultra-broadband
from
a
halide
(CuI)
nanocluster
single
emitter
prepared
by
one-step
solution
synthesis-deposition
process,
through
dedicated
design
ligands
and
subtle
selection
solvents.
CuI
exhibits
high
rigidity
in
the
excitation
state
as
well
dual-emissive
modes
phosphorescence
temperature-activated
delayed
fluorescence,
enabling
uniform
cluster-composed
film
show
excellent
stability
photoluminescent
efficiency.
In
consequence,
light-emitting
diodes
(LEDs)
present
nearly
identical
performance
inert
or
air
atmosphere
without
encapsulation
outstanding
high-temperature
operation
performance,
reaching
full
width
at
half
maximum
(FWHM)
~120
nm,
peak
external
quantum
efficiency
13%,
record
luminance
~50,000
cd
m
−2
,
operating
half-lifetime
137
h
100
.
results
highlight
potential
nanoclusters
next-generation
lighting.
